CN117683964A - Method for treating slag deposited below inside of converter back furnace cap - Google Patents
Method for treating slag deposited below inside of converter back furnace cap Download PDFInfo
- Publication number
- CN117683964A CN117683964A CN202410092652.6A CN202410092652A CN117683964A CN 117683964 A CN117683964 A CN 117683964A CN 202410092652 A CN202410092652 A CN 202410092652A CN 117683964 A CN117683964 A CN 117683964A
- Authority
- CN
- China
- Prior art keywords
- converter
- slag
- oxygen
- cap
- furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002893 slag Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 22
- 239000001301 oxygen Substances 0.000 claims abstract description 22
- 238000009825 accumulation Methods 0.000 claims abstract description 12
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 238000010926 purge Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 abstract description 7
- 238000009628 steelmaking Methods 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000009749 continuous casting Methods 0.000 abstract description 2
- 238000007664 blowing Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4693—Skull removal; Cleaning of the converter mouth
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4606—Lances or injectors
- C21C5/462—Means for handling, e.g. adjusting, changing, coupling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention belongs to the field of steelmaking continuous casting, and relates to a method for treating slag accumulation below the inner part of a rear furnace cap of a converter, which comprises the steps of rocking the converter backwards by a certain angle, controlling the height of a nozzle of an oxygen lance by using a traditional oxygen lance, and directly blowing a thickened area by using oxygen to thin the slag accumulation below the rear furnace cap of the converter; by implementing the method, the slag accumulation thickness of the converter cap of the converter is effectively controlled, the success rate of slag blocking of the converter is improved, the slag discharging amount of tapping is reduced, the component improvement is reduced, and the cost reduction of the steelmaking process is facilitated.
Description
Technical Field
The invention belongs to the field of steelmaking continuous casting, and relates to a method for treating slag accumulation below the inner part of a furnace cap after a converter.
Background
Along with continuous optimization of the converter smelting process, the tapping temperature is reduced, the carbon content of the end point of the converter is increased, and the smelting process is favorably promoted to reduce cost. However, the slag with low temperature and viscosity is slowly accumulated under the rear furnace cap and around the tapping hole of the converter in the tapping process of the converter, and the tapping operation of the converter is affected after the slag reaches a certain thickness. The accumulated slag near the furnace mouth is usually treated by a furnace disassembly vehicle, but the accumulated slag inside the converter is very difficult to treat, and some units treat the accumulated slag by manufacturing a special oxygen lance nozzle, but the input cost is higher.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for treating slag deposited under the interior of a rear furnace cap of a converter, which comprises the steps of shaking the converter backwards at a certain angle, controlling the height of an oxygen lance nozzle by a conventional oxygen lance, and directly purging a thickened region by oxygen to thin slag deposited under the rear furnace cap of the converter.
In order to achieve the above purpose, the present invention provides the following technical solutions: the method for treating slag deposited below the inside of the converter back furnace cap comprises the following steps:
s1, after the converter finishes steel discharging, the converter is rocked backwards to minus 20-12 degrees, so that an oxygen lance is effectively aligned to a slag accumulation position;
s2, starting a primary dust removal fan to high speed, and preventing a large amount of yellow smoke from overflowing when slag is accumulated by brushing;
s3, setting the oxygen lance flow to 70% of the normal flow;
s4, opening oxygen, and adjusting the gun position of the oxygen gun to 6.0-6.4 meters at the same time, and continuously adjusting the gun position during purging;
s5, after purging, pouring out a part of slag in the furnace, and then performing slag splashing furnace protection operation;
s6, continuously operating the 2-3 furnaces in the above operation.
Optionally, in the step S4, the purging time is 3-5min.
The invention has the beneficial effects that: according to the invention, the converter is rocked backwards by a certain angle, the height of the oxygen lance nozzle is controlled by using the traditional oxygen lance, and the thickened area is directly purged by using oxygen, so that the accumulated slag below the rear furnace cap of the converter is thinned, and the method has short treatment time and is convenient; by implementing the method, the slag accumulation thickness of the converter cap of the converter is effectively controlled, the success rate of slag blocking of the converter is improved, the slag discharging amount of tapping is reduced, the component improvement is reduced, and the cost reduction of the steelmaking process is facilitated.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
The invention relates to a method for treating slag accumulation below the inside of a converter back furnace cap, which comprises the following steps:
1. after the steel is discharged, the converter is rocked backwards to minus 20-12 degrees, so that the oxygen lance is effectively aligned to the slag accumulation position;
2. starting a primary dust removing fan to high speed, and preventing a large amount of yellow smoke from overflowing when slag is accumulated;
3. setting the oxygen lance flow to 70% of the normal flow;
4. opening oxygen, adjusting the gun position of the oxygen gun to 6.0-6.4 meters at the same time, and continuously adjusting the gun position during purging;
5. the purging time is controlled according to 3-5 min;
6. after purging, pouring out a part of slag in the furnace, and then performing slag splashing furnace protection operation;
7. the above operation continuously operated the 2-3 furnace.
Before treatment, the thickness of the furnace lining is about 850mm, and after the treatment by adopting the method provided by the invention, the thickness of the furnace lining is reduced to about 700cm, so that the effect is obvious; by implementing the method, the slag accumulation thickness of the converter cap of the converter is effectively controlled, the success rate of slag blocking of the converter is improved, the slag discharging amount of tapping is reduced, the component improvement is reduced, and the cost reduction of the steelmaking process is facilitated.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (2)
1. The method for treating slag accumulation below the inside of the converter back furnace cap is characterized by comprising the following steps:
s1, after the converter finishes steel discharging, the converter is rocked backwards to minus 20-12 degrees, so that an oxygen lance is effectively aligned to a slag accumulation position;
s2, starting a primary dust removal fan to high speed, and preventing a large amount of yellow smoke from overflowing when slag is accumulated by brushing;
s3, setting the oxygen lance flow to 70% of the normal flow;
s4, opening oxygen, and adjusting the gun position of the oxygen gun to 6.0-6.4 meters at the same time, and continuously adjusting the gun position during purging;
s5, after purging, pouring out a part of slag in the furnace, and then performing slag splashing furnace protection operation;
s6, continuously operating the 2-3 furnaces in the above operation.
2. The method for treating slag accumulation under the inside of a post-converter hood according to claim 1, wherein: in the step S4, the purging time is 3-5min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410092652.6A CN117683964A (en) | 2024-01-23 | 2024-01-23 | Method for treating slag deposited below inside of converter back furnace cap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410092652.6A CN117683964A (en) | 2024-01-23 | 2024-01-23 | Method for treating slag deposited below inside of converter back furnace cap |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117683964A true CN117683964A (en) | 2024-03-12 |
Family
ID=90133675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410092652.6A Pending CN117683964A (en) | 2024-01-23 | 2024-01-23 | Method for treating slag deposited below inside of converter back furnace cap |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117683964A (en) |
-
2024
- 2024-01-23 CN CN202410092652.6A patent/CN117683964A/en active Pending
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |